TWI647718B - Iron core for static induction device - Google Patents

Abstract

The problem of the present invention is that even when an amorphous magnetic thin ribbon is used for the inner core, there is no need to use a supporting member, the mechanical strength is improved, and the magnetic loss is small. In order to solve the above-mentioned problems, the core for the static induction device of the present invention is characterized by comprising an inner core and an outer core. The inner core is formed of an amorphous magnetic thin strip, and the outer core is disposed on the inner side so as to sandwich the inner core The iron core is formed of silicon steel plates on both sides in the deep direction relative to the standing direction.

Description

Iron core for static induction device

The present invention relates to a core for a static induction device, and particularly to a core for a static induction device suitable for use with amorphous magnetic thin strips and silicon steel plates for the core of a static induction device such as a transformer or a reactor.

In recent years, as one of the cores for static induction devices, for example, the cores for energy-saving transformers use amorphous magnetic materials with low magnetic loss and excellent magnetic characteristics. The amorphous magnetic ribbon used in the transformer core is produced by ultra-quick cooling of the melt of the magnetic alloy. The magnetic loss is very small and it has excellent magnetic properties. However, the amorphous magnetic ribbon forming the iron core is hard and brittle, and is formed by stacking up to several hundreds of thin ribbons with a thickness of 25 μm. Therefore, mechanical strength and rigidity cannot be obtained sufficiently. It is difficult to stand up like a steel plate. Therefore, for example, in the multi-phase transformer core described in Patent Document 1, as the material constituting the multi-phase transformer core, it is desired to use an amorphous magnetic ribbon wound on the inner core that will be effective for reducing magnetic loss, and The outer core is made by winding or laminating silicon steel plates, and it is a composite structure of the inner and outer cores. It seeks to achieve the characteristics of magnetic loss and the improvement of the mechanical strength and rigidity of the core at the same time, ensuring the workability during assembly operations. . [Prior Art Document] [Patent Document] [Patent Document 1] Japanese Patent Laid-Open No. 8-88128

[Problems to be Solved by the Invention] As a method for overcoming the lack of mechanical strength and rigidity of the core for the static induction device, in Patent Document 1, the following method is implemented: using an amorphous magnetic thin strip that is effective for reducing magnetic loss on the inner core Those obtained by winding, and those obtained by winding or laminating silicon steel sheets for the outer core, are used as a composite structure of two cores on the inner side and the outer side, in order to achieve the characteristics of magnetic loss and the improvement of the mechanical strength and rigidity of the core at the same time. Ensure workability during assembly operations. Generally, the saturation magnetic flux density of the amorphous magnetic thin strip at 50 Hz is about 1.6 T, and the saturation magnetic flux density of the silicon steel plate is about 2.0 T. Therefore, in order to average the magnetic flux density distribution in the core, the inner core It is more advantageous to configure the amorphous magnetic ribbon, and it is generally of such a structure. However, in the case of using an amorphous magnetic ribbon for the inner core, since the amorphous magnetic ribbon is difficult to stand up on its own, a support member (for example, SUS (Stainless Steel, stainless steel) material) is required, and the support member is stray The loss may increase. In addition, since the load of the silicon steel sheet is applied to the amorphous magnetic thin strip, there is a possibility that the magnetic loss may increase due to the load. The present invention has been completed in view of the above aspects, and its object is to provide a core for a static induction device, which does not require the use of a supporting member even when an amorphous magnetic ribbon is used for the inner core, and the mechanical strength is improved and the magnetic loss small. [Technical Means for Solving the Problem] In order to achieve the above object, the core for a static induction device of the present invention is characterized by comprising an inner core and an outer core. The inner core is formed of an amorphous magnetic thin strip, and the outer core is sandwiched by the inner core The way of the iron core is arranged on both sides of the inner iron core with respect to the deep direction of the standing direction, and is formed of silicon steel plate. [Effects of the Invention] According to the present invention, a core for a static induction device can be obtained. Even when an amorphous magnetic ribbon is used for the inner core, a support member is not necessary, and the mechanical strength is improved and the magnetic loss is small.

Hereinafter, the iron core for the static induction device of the present invention will be described based on the illustrated embodiment. Furthermore, in each embodiment, the same symbols are used for the same constituent parts. [Embodiment 1] FIGS. 1(a) and 1(b) show Embodiment 1 of the iron core for a static induction device of the present invention. FIG. 1(a) is a diagram obtained by observing the iron core from an oblique direction, and FIG. 1(b) It is a detailed sectional view of part B of FIG. 1(a) obtained by partially enlarging the cross section of the magnetic leg so that the internal structure of the magnetic leg becomes clear. Furthermore, in the iron core for a static induction device of this embodiment, the arrow X direction in FIG. 1(a) is defined as a lateral direction, the arrow Y direction is defined as a longitudinal direction, and the arrow Z direction is defined as a width direction. As shown in FIGS. 1(a) and 1(b), the iron core for a static induction device of this embodiment is roughly configured by including an inner iron core 1 and an outer iron core 2. The inner iron core 1 is formed of an amorphous magnetic thin strip. The above-mentioned outer core 2 is arranged to sandwich the inner core 1 in a deeper direction (width direction: FIG. 1) with respect to the standing direction (longitudinal: arrow Y direction in FIG. 1(a)) of the inner core 1 (a) Arrow Z direction) on both sides, and formed of silicon steel sheet. In the iron core for the static induction device of this embodiment, the inner iron core 1 is a wound iron core 1A formed by winding an amorphous magnetic thin strip in a substantially rectangular shape, and the outer iron core 2 is formed by shifting the silicon steel sheet side by a fixed amount by an area layer The product iron core 2A. In addition, the inner core 1 may be formed by laminating a long amorphous magnetic thin strip and then the two ends are butted to form a substantially rectangular shape, and the outer core 2 may also be formed by winding a silicon steel plate into a substantially rectangular shape. Generally, an amorphous magnetic ribbon is relatively thin because its thickness is several tens of μm, and as many as several hundred sheets of amorphous magnetic ribbon are laminated, it is difficult to stand up on its own. On the other hand, since the silicon steel sheet has a thickness of about 10 times the thickness of the amorphous magnetic ribbon, it can be configured to stand up on its own. Therefore, the outer core 2 formed of silicon steel sheet is disposed on the outer periphery of the inner core 1 formed of the amorphous magnetic thin strip so as to sandwich the inner core 1, thereby suppressing the inner core 1 formed of the amorphous magnetic thin strip Deformed shape. 2(a) shows a cross-sectional view along the line AA' of FIG. 1(b) in the first embodiment of the iron core for a static induction device of the present invention, that is, the iron core for a static induction device shown in FIG. 1(b) The cross-sectional view of the iron core after being divided into two parts upwards to the deep prescription (AA' cross-section of FIG. 1(b)), FIG. 2(b) is an enlarged view of part C of FIG. 2(a). As shown in FIG. 2(b), the corners of the corner portion of the product core 2A formed of silicon steel sheet have curvature, thereby avoiding the concentration of the load of the wound core 1A formed of the amorphous magnetic ribbon on the corner portion. In addition, it may be configured to cut a part of the corner portion of the product core 2A formed of a silicon steel sheet. Furthermore, by interposing an insulating material, such as a press plate, between the wound core 1A formed of an amorphous magnetic thin strip and the accumulated core 2A formed of a silicon steel plate, the wound core 1A can be protected and vibration deviation and vibration can be suppressed. In addition, the accumulated core 2A formed of a silicon steel sheet is laminated in a direction (longitudinal direction Y) perpendicular to the accumulation direction (width direction Z) of the wound core 1A formed of an amorphous magnetic thin strip. As in this embodiment, on both sides of the inner core 1 (roll core 1A) toward the depth direction with respect to the standing direction, the inner core 1 (roll core 1A) is arranged in a manner to sandwich the inner core 1 (roll core 1A). Outer core 2 (accumulated core 2A), thereby maintaining the shape of inner core 1 (rolled core 1A) arranged inside the magnetic foot, and using outer side core 2 (accumulated core 2A) formed of silicon steel sheet to withstand stress sensitivity The load of the inner core 1 (rolled core 1A) formed by the amorphous magnetic thin strip, so that it is not necessary to provide a support member supporting the inner core 1 (rolled core 1A) formed of the amorphous magnetic strip, and the support member can be realized Reduction and loss due to load reduction. Therefore, according to the present embodiment, a core for a static induction device can be obtained. Even when an amorphous magnetic ribbon is used for the inner core 1, a support member is not necessary, mechanical strength is improved, and magnetic loss is small. [Embodiment 2] Fig. 3(a) and Fig. 3(b) show Embodiment 2 of the iron core for a static induction device of the present invention. The static induction device of the present embodiment shown in the figure is configured as follows, in addition to the structure described in the above embodiment 1, the outermost periphery of the accumulated core 2A formed of silicon steel sheet and the amorphous A silicon steel sheet 3 wound into a substantially rectangular shape is arranged between the innermost circumferences of the wound core 1A formed of a magnetic thin strip. According to the configuration of this embodiment, of course, the same effect as that of Embodiment 1 can be obtained, and by disposing the silicon steel plate 3, the amorphous magnetic thin ribbon of the wound core 1A can be protected from contact with the accumulated core 2 Damaged. [Embodiment 3] FIGS. 4(a) and 4(b) show Embodiment 3 of the iron core for a static induction device of the present invention. The iron core for the static induction device of the present embodiment shown in the figure, in addition to the structure described in the first embodiment described above, is formed by forming a stepped lap joint 4 formed at the corner of the product core 2A formed of silicon steel sheet in The gap 4a between the silicon steel plates 2a and 2b becomes larger, and the gap length between the wound core 1A and the accumulated core 2A becomes the same. According to the configuration of this embodiment, of course, the same effect as that of Embodiment 1 can be obtained, and the magnetic resistance of the wound core 1A formed of the amorphous magnetic thin strip and the accumulated core 2A formed of the silicon steel plate can be made substantially the same, and It can reduce the uneven distribution of the magnetic flux density in the core. [Embodiment 4] FIG. 5 shows Embodiment 4 of the core for a static induction device of the present invention. The static induction device of the present embodiment shown in the figure is configured as follows. In addition to the configuration described in the above-mentioned first embodiment, the yoke portion, which is the yoke portion, is formed in the product core 2A formed of silicon steel sheet. Parts, and a gap is provided in the core joint 5 formed by dividing into two parts. The core joint 5 may be a step-lap type or an end-lap type. According to the configuration of this embodiment, of course, the same effect as that of Embodiment 1 can be obtained, and by providing a gap in the core joint 5 and adjusting the gap length, the wound core 1A formed of the amorphous magnetic ribbon can be made The magnetic resistance of the product core 2A formed by the silicon steel plate is approximately the same, and the uneven distribution of the magnetic flux density in the core can be reduced. In addition, the portion where the gap is provided need not be limited to the center of the yoke portion, and may be near the both end portions of the yoke portion and the leg portion. [Embodiment 5] FIGS. 6(a) and 6(b) show Embodiment 5 of the iron core for a static induction device of the present invention. The static induction device of the present embodiment shown in the figure is configured as follows, in addition to the configuration described in the above embodiment 1, the wound core 1A formed of an amorphous magnetic ribbon and the silicon steel sheet A guide 6 for load distribution is provided between the formed iron cores 2A. According to the configuration of this embodiment, of course, the same effect as that of Embodiment 1 can be obtained, and the guide core 6 can be used to make the product core 2A formed by the silicon steel plate and the winding core 1A formed by the amorphous magnetic thin strip. The load applied by the contact portion 1a is dispersed, and it is possible to prevent an increase in magnetic loss. Furthermore, the present invention is not limited to the above-mentioned embodiment, and includes various modifications. For example, the above-mentioned embodiments are described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described structures. In addition, a part of the configuration of a certain embodiment may be replaced with the configuration of another embodiment, and a configuration of another embodiment may be added to the configuration of a certain embodiment. In addition, it is possible to add, delete, or replace part of the configuration of each embodiment with other configurations.

1‧‧‧Inner iron core

1A‧‧‧roll iron core

1a‧‧‧The overlapping part of the core

2‧‧‧Outer iron core

2A‧‧‧Iron core

2a‧‧‧Silicon steel plate

2b‧‧‧Silicon steel plate

3‧‧‧Silicon steel plate

4‧‧‧ Step overlap joint

4a‧‧‧The gap of the step overlap joint

5‧‧‧Iron joint

6‧‧‧Guide

FIG. 1(a) is a perspective view showing Embodiment 1 of the iron core for a static induction device of the present invention. FIG. 1(b) is a detailed sectional view of part B of FIG. 1(a). 2(a) is a cross-sectional view taken along line AA' of FIG. 1(b) in Embodiment 1 of the iron core for a static induction device of the present invention. FIG. 2(b) is an enlarged detailed view of part C of FIG. 2(a). Fig. 3(a) is a view corresponding to Fig. 2(a) showing Embodiment 2 of the core for a static induction device of the present invention. FIG. 3(b) is an enlarged detailed view of part D of FIG. 3(a). FIG. 4(a) is a cross-sectional view showing one core of Embodiment 3 of the core for the static induction device of the present invention. FIG. 4(b) is an enlarged detailed view of part E of FIG. 4(a). 5 is a cross-sectional view of one core of Embodiment 4 of the core for the static induction device of the present invention. Fig. 6(a) is a cross-sectional view showing one core of the fifth embodiment of the core for the static induction device of the present invention. FIG. 6(b) is a detailed cross-sectional view of part F of FIG. 6(a).

Claims (9)

An iron core for a static induction device, characterized by comprising an inner iron core and an outer iron core, wherein the inner iron core is formed of an amorphous magnetic thin strip, and the outer iron core is arranged on the inner iron core with respect to the vertical installation so as to sandwich the inner iron core The two sides of the direction toward the deep direction are formed by silicon steel plates. The iron core for a static induction device according to claim 1, wherein the inner iron core is a wound iron core formed by winding the amorphous magnetic ribbon, and the outer iron core is an iron core formed by layering the silicon steel sheet by a fixed amount and an area. An iron core for a static induction device according to claim 2, wherein the iron core is formed with a stepped joint at its corner. An iron core for a static induction device according to claim 2, wherein the corner of the iron core has a curvature on the outer peripheral side or the corner of the iron core is partially cut away. An iron core for a static induction device according to claim 2, wherein an insulating material is interposed between the wound iron core and the accumulated iron core. The core for the static induction device according to claim 2, wherein a silicon steel plate is arranged between the outermost periphery of the accumulated core and the innermost periphery of the wound core. The core for a static induction device according to claim 3, wherein the gap formed between the stepped lap joints between the silicon steel plates is a gap length where the magnetic resistance of the wound core and the accumulated iron core becomes the same. An iron core for a static induction device according to claim 2, wherein the iron core, that is, the yoke portion is divided into two parts, and a gap is formed in the iron core joint formed by dividing into two parts. The core for the static induction device according to claim 2, wherein a guide for load distribution is provided between the wound core and the accumulated core.